IWC Schaffhausen ingenieur constant-force tourbillon Mode D'emploi page 20

This watch has a screw­in crown. Screwing the crown in to its normal position (X)
prevents the inadvertent adjustment of the time or the moon phase indication and
also acts as a double seal to prevent water from seeping into the case. To release the
crown, unscrew it by turning it to the left, where it automatically assumes position 0,
the winding position. By depressing the crown in position X and turning it to the right
at the same time, it is screwed down firmly again and secured.
F u n C t I o n s o F t h e C r o W n
Normal position (screwed in)
X —
Winding position
0 —
Moon phase setting
1 —
2 —
n o r M a l p o s I t I o n
I n g e n I e u r C o n s t a n t - F o r C e t o u r b I l l o n
— 2 0 —
X
Time setting
0 1 2